System for the control of the charge of alpha storage battery



SYSTEM FOR THE CONTROL OF THE CHARGE OF A STORAGE BATTERY Filed July 30, 1931 //YV!V70R Irv/v5.93: r

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. sponsive to its voltage.

. Patented Feb. 23, 1932 Application filed July 30,

The object of my invention is to improve a storage battery charging circuit having a genthe two latter elements being connected in parallel. There is 'thus provided means whereby the battery is always connected to A the generator to first receive a charge at the igh rate. v

For a further description of my invention reference may be had to the annexed drawing and specification at the end whereof my invention will b specifically pointed out and claimed The accompanying drawing is a diagram showing .In the d type, whose main brushes 3 and 4 are connected respecis a storage battery connected at one terminal to the w switch 16, to conductor 1. 'L

position to close the contacts 9 by its own weight or by the spring 30 or both and is attracted to open the contacts at 9 by the electromagnet 12, whose coil 13 is connected at one end by conductor 14 to conductor 1 and at the other end by conductor 15 through adjustable resistor 24 and bimetallic strip 25 actuated by the temperature of the surrounding atmosphere and conductor 29 to conductor 2. The coil thus connected across the main brushes of the generator G and is e automatic switch rawlng, G is a charging generator her terminal, via conductor 21 andthe contacts 17 of automatic f therefore re- .c

indicated generally at l6may be of any well known type adapted to connect the generator the battery B when the vol generator reaches a predetermined value, this being providedwith contacts 17, one 53 of which is supported on the armature 18, pivoted at 19. he switch has the usual series coil 20 and a sh end to conductor 1 and at the 0th conductor 23 through resistor 24 tallic strip '25 and conductor 29, to conductor t will eseen that coils 13 and 22 are le resistor 24. a series of conwhich the free e variab is resistor is provided with tact points 26, 27 and end of the bimetallic curvature changes in response to variations of temperature in the well known manner. 7

he control of the excitation of the voltage responsive coil 13 b of the temperad the bimetallic strip 25 is similar to that described in my prior application Serial No. 412,016, filed Dec. 6, 1929, and its object is, as in the prior application, to provide for,

he voltage at which ange is effected for a hi her value in winter than in summer since the voltage of the battery while chargin is higher atlow temperature than at hi er temperatures, 5 other conditions being t e same. The adjustment is such that when the desired voltage is reached the magnet 12 lifts the armaure 10, opening the contacts at 9 and thus insertin the resistor 7 in series coil 6, t ereby reducing the voltage and the output of generator G.,

It is important that the automatic switch 16 shall always close before th voltage reaches a value sufficient unt coil 22 connected at one,

charging rate of the battery I justment is such that in cold weather the automatic switch closes before the voltage responsive relay opens its contacts 9, in warm weather when the voltage at which the con- 5 tacts 9 are opened is reduced by means of the thermal responsive device and when, on account of the increased resistance of coil 22 at higher temperatures, the voltage at which the automatic. switch closes is greater, 10 conditions may arise which will cause the automatic switch to close only after the contacts at 9 have been opened and the battery will never get the high rate charge. To obviate this dilficulty, I have so connecte the two coils 13 and 22 that they are both controlled in parallel by the thermal responsive device. When therefore in response to higher temperatures the bimetallic strip cuts out some or all of the resistance 24, thus causing the voltage responsive relay to open the contacts 9 at a lower voltage, the auto matic switch will also close at a lower volt-' age and by proper design and adjustment, the apparatus may be caused to function so 25 that the automatic switch will always close before the contacts at 9 are opened regardless of changes of temperature.

I do not intend to be limited in the practice of my invention save as the scope ofthe 0 prior art and of the attached claims may require. I I claim: 1. In combination, a battery, a generator and its circuit, an automatic switch adapted to connect the generator to the battery at a predetermined generator voltage, said switch aving a'closing coil connected across the generator terminals, and means for adjusting the generator output selectively at either a 40 higher or lower value, said means including an actuating coil connected across the generator circuit, and a variable resistor connected in series both with the closing coil and with the actuating coil and means responsive to the surrounding temperature for varying said resistance.

2. In-combination, a battery, a generator and its circuit,.an automatic switch adapted 1 to connect the generator to the battery at a 5 predetermined generator voltage, said switch having a closing coil connected across the generator terminals, and means for adjusting the generator output selectively at either a higher or lower value, said means including 5 an actuating coil connected across the generator circuit, and means responsive to the temperature of its surroundings andconnected in series with both the closing coil and the x a actuating coilfor varying the voltage at which said coils operate. WILLIAM G. LEINGANG. 

